- Joined
- Aug 7, 2007
- Messages
- 1,734
- Reaction score
- 536
- Points
- 113
- Location
- Costa Mesa, CA
- Vehicle Year
- 2002
- Make / Model
- Ford
- Engine Type
- 4.0 V6
- Engine Size
- 4.0 SOHC
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- Tire Size
- 33"
I have not replaced my O2 sensors in over 150K miles. I am noticing fuel mileage starting to drop, but my Ranger is still running great. I thought I would try replacing the O2 sensors since they are overdue anyway.
A question is, would worn upstream O2 sensors have the most affect on fuel mileage? I am thinking the downstream sensor is more related to emissions check more so that the upstream O2 sensors.
The one downstream O2 sensor for a manual transmission cost more than both of the upstream O2 sensors together. I thought I would start with the upstream O2 sensors first to see if that makes any improvement in fuel mileage, or should I just bite the bullet and buy all three?
A question is, would worn upstream O2 sensors have the most affect on fuel mileage? I am thinking the downstream sensor is more related to emissions check more so that the upstream O2 sensors.
The one downstream O2 sensor for a manual transmission cost more than both of the upstream O2 sensors together. I thought I would start with the upstream O2 sensors first to see if that makes any improvement in fuel mileage, or should I just bite the bullet and buy all three?